1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365
|
/* expr.c -operands, expressions-
Copyright (C) 1987-2014 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
/* This is really a branch office of as-read.c. I split it out to clearly
distinguish the world of expressions from the world of statements.
(It also gives smaller files to re-compile.)
Here, "operand"s are of expressions, not instructions. */
#define min(a, b) ((a) < (b) ? (a) : (b))
#include "as.h"
#include "safe-ctype.h"
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifndef CHAR_BIT
#define CHAR_BIT 8
#endif
static void floating_constant (expressionS * expressionP);
static valueT generic_bignum_to_int32 (void);
#ifdef BFD64
static valueT generic_bignum_to_int64 (void);
#endif
static void integer_constant (int radix, expressionS * expressionP);
static void mri_char_constant (expressionS *);
static void clean_up_expression (expressionS * expressionP);
static segT operand (expressionS *, enum expr_mode);
static operatorT operatorf (int *);
extern const char EXP_CHARS[], FLT_CHARS[];
/* We keep a mapping of expression symbols to file positions, so that
we can provide better error messages. */
struct expr_symbol_line {
struct expr_symbol_line *next;
symbolS *sym;
char *file;
unsigned int line;
};
static struct expr_symbol_line *expr_symbol_lines;
/* Build a dummy symbol to hold a complex expression. This is how we
build expressions up out of other expressions. The symbol is put
into the fake section expr_section. */
symbolS *
make_expr_symbol (expressionS *expressionP)
{
expressionS zero;
symbolS *symbolP;
struct expr_symbol_line *n;
if (expressionP->X_op == O_symbol
&& expressionP->X_add_number == 0)
return expressionP->X_add_symbol;
if (expressionP->X_op == O_big)
{
/* This won't work, because the actual value is stored in
generic_floating_point_number or generic_bignum, and we are
going to lose it if we haven't already. */
if (expressionP->X_add_number > 0)
as_bad (_("bignum invalid"));
else
as_bad (_("floating point number invalid"));
zero.X_op = O_constant;
zero.X_add_number = 0;
zero.X_unsigned = 0;
zero.X_extrabit = 0;
clean_up_expression (&zero);
expressionP = &zero;
}
/* Putting constant symbols in absolute_section rather than
expr_section is convenient for the old a.out code, for which
S_GET_SEGMENT does not always retrieve the value put in by
S_SET_SEGMENT. */
symbolP = symbol_create (FAKE_LABEL_NAME,
(expressionP->X_op == O_constant
? absolute_section
: expressionP->X_op == O_register
? reg_section
: expr_section),
0, &zero_address_frag);
symbol_set_value_expression (symbolP, expressionP);
if (expressionP->X_op == O_constant)
resolve_symbol_value (symbolP);
n = (struct expr_symbol_line *) xmalloc (sizeof *n);
n->sym = symbolP;
as_where (&n->file, &n->line);
n->next = expr_symbol_lines;
expr_symbol_lines = n;
return symbolP;
}
/* Return the file and line number for an expr symbol. Return
non-zero if something was found, 0 if no information is known for
the symbol. */
int
expr_symbol_where (symbolS *sym, char **pfile, unsigned int *pline)
{
register struct expr_symbol_line *l;
for (l = expr_symbol_lines; l != NULL; l = l->next)
{
if (l->sym == sym)
{
*pfile = l->file;
*pline = l->line;
return 1;
}
}
return 0;
}
/* Utilities for building expressions.
Since complex expressions are recorded as symbols for use in other
expressions these return a symbolS * and not an expressionS *.
These explicitly do not take an "add_number" argument. */
/* ??? For completeness' sake one might want expr_build_symbol.
It would just return its argument. */
/* Build an expression for an unsigned constant.
The corresponding one for signed constants is missing because
there's currently no need for it. One could add an unsigned_p flag
but that seems more clumsy. */
symbolS *
expr_build_uconstant (offsetT value)
{
expressionS e;
e.X_op = O_constant;
e.X_add_number = value;
e.X_unsigned = 1;
e.X_extrabit = 0;
return make_expr_symbol (&e);
}
/* Build an expression for the current location ('.'). */
symbolS *
expr_build_dot (void)
{
expressionS e;
current_location (&e);
return symbol_clone_if_forward_ref (make_expr_symbol (&e));
}
/* Build any floating-point literal here.
Also build any bignum literal here. */
/* Seems atof_machine can backscan through generic_bignum and hit whatever
happens to be loaded before it in memory. And its way too complicated
for me to fix right. Thus a hack. JF: Just make generic_bignum bigger,
and never write into the early words, thus they'll always be zero.
I hate Dean's floating-point code. Bleh. */
LITTLENUM_TYPE generic_bignum[SIZE_OF_LARGE_NUMBER + 6];
FLONUM_TYPE generic_floating_point_number = {
&generic_bignum[6], /* low. (JF: Was 0) */
&generic_bignum[SIZE_OF_LARGE_NUMBER + 6 - 1], /* high. JF: (added +6) */
0, /* leader. */
0, /* exponent. */
0 /* sign. */
};
static void
floating_constant (expressionS *expressionP)
{
/* input_line_pointer -> floating-point constant. */
int error_code;
error_code = atof_generic (&input_line_pointer, ".", EXP_CHARS,
&generic_floating_point_number);
if (error_code)
{
if (error_code == ERROR_EXPONENT_OVERFLOW)
{
as_bad (_("bad floating-point constant: exponent overflow"));
}
else
{
as_bad (_("bad floating-point constant: unknown error code=%d"),
error_code);
}
}
expressionP->X_op = O_big;
/* input_line_pointer -> just after constant, which may point to
whitespace. */
expressionP->X_add_number = -1;
}
static valueT
generic_bignum_to_int32 (void)
{
valueT number =
((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
| (generic_bignum[0] & LITTLENUM_MASK);
number &= 0xffffffff;
return number;
}
#ifdef BFD64
static valueT
generic_bignum_to_int64 (void)
{
valueT number =
((((((((valueT) generic_bignum[3] & LITTLENUM_MASK)
<< LITTLENUM_NUMBER_OF_BITS)
| ((valueT) generic_bignum[2] & LITTLENUM_MASK))
<< LITTLENUM_NUMBER_OF_BITS)
| ((valueT) generic_bignum[1] & LITTLENUM_MASK))
<< LITTLENUM_NUMBER_OF_BITS)
| ((valueT) generic_bignum[0] & LITTLENUM_MASK));
return number;
}
#endif
static void
integer_constant (int radix, expressionS *expressionP)
{
char *start; /* Start of number. */
char *suffix = NULL;
char c;
valueT number; /* Offset or (absolute) value. */
short int digit; /* Value of next digit in current radix. */
short int maxdig = 0; /* Highest permitted digit value. */
int too_many_digits = 0; /* If we see >= this number of. */
char *name; /* Points to name of symbol. */
symbolS *symbolP; /* Points to symbol. */
int small; /* True if fits in 32 bits. */
/* May be bignum, or may fit in 32 bits. */
/* Most numbers fit into 32 bits, and we want this case to be fast.
so we pretend it will fit into 32 bits. If, after making up a 32
bit number, we realise that we have scanned more digits than
comfortably fit into 32 bits, we re-scan the digits coding them
into a bignum. For decimal and octal numbers we are
conservative: Some numbers may be assumed bignums when in fact
they do fit into 32 bits. Numbers of any radix can have excess
leading zeros: We strive to recognise this and cast them back
into 32 bits. We must check that the bignum really is more than
32 bits, and change it back to a 32-bit number if it fits. The
number we are looking for is expected to be positive, but if it
fits into 32 bits as an unsigned number, we let it be a 32-bit
number. The cavalier approach is for speed in ordinary cases. */
/* This has been extended for 64 bits. We blindly assume that if
you're compiling in 64-bit mode, the target is a 64-bit machine.
This should be cleaned up. */
#ifdef BFD64
#define valuesize 64
#else /* includes non-bfd case, mostly */
#define valuesize 32
#endif
if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) && radix == 0)
{
int flt = 0;
/* In MRI mode, the number may have a suffix indicating the
radix. For that matter, it might actually be a floating
point constant. */
for (suffix = input_line_pointer; ISALNUM (*suffix); suffix++)
{
if (*suffix == 'e' || *suffix == 'E')
flt = 1;
}
if (suffix == input_line_pointer)
{
radix = 10;
suffix = NULL;
}
else
{
c = *--suffix;
c = TOUPPER (c);
/* If we have both NUMBERS_WITH_SUFFIX and LOCAL_LABELS_FB,
we distinguish between 'B' and 'b'. This is the case for
Z80. */
if ((NUMBERS_WITH_SUFFIX && LOCAL_LABELS_FB ? *suffix : c) == 'B')
radix = 2;
else if (c == 'D')
radix = 10;
else if (c == 'O' || c == 'Q')
radix = 8;
else if (c == 'H')
radix = 16;
else if (suffix[1] == '.' || c == 'E' || flt)
{
floating_constant (expressionP);
return;
}
else
{
radix = 10;
suffix = NULL;
}
}
}
switch (radix)
{
case 2:
maxdig = 2;
too_many_digits = valuesize + 1;
break;
case 8:
maxdig = radix = 8;
too_many_digits = (valuesize + 2) / 3 + 1;
break;
case 16:
maxdig = radix = 16;
too_many_digits = (valuesize + 3) / 4 + 1;
break;
case 10:
maxdig = radix = 10;
too_many_digits = (valuesize + 11) / 4; /* Very rough. */
}
#undef valuesize
start = input_line_pointer;
c = *input_line_pointer++;
for (number = 0;
(digit = hex_value (c)) < maxdig;
c = *input_line_pointer++)
{
number = number * radix + digit;
}
/* c contains character after number. */
/* input_line_pointer->char after c. */
small = (input_line_pointer - start - 1) < too_many_digits;
if (radix == 16 && c == '_')
{
/* This is literal of the form 0x333_0_12345678_1.
This example is equivalent to 0x00000333000000001234567800000001. */
int num_little_digits = 0;
int i;
input_line_pointer = start; /* -> 1st digit. */
know (LITTLENUM_NUMBER_OF_BITS == 16);
for (c = '_'; c == '_'; num_little_digits += 2)
{
/* Convert one 64-bit word. */
int ndigit = 0;
number = 0;
for (c = *input_line_pointer++;
(digit = hex_value (c)) < maxdig;
c = *(input_line_pointer++))
{
number = number * radix + digit;
ndigit++;
}
/* Check for 8 digit per word max. */
if (ndigit > 8)
as_bad (_("a bignum with underscores may not have more than 8 hex digits in any word"));
/* Add this chunk to the bignum.
Shift things down 2 little digits. */
know (LITTLENUM_NUMBER_OF_BITS == 16);
for (i = min (num_little_digits + 1, SIZE_OF_LARGE_NUMBER - 1);
i >= 2;
i--)
generic_bignum[i] = generic_bignum[i - 2];
/* Add the new digits as the least significant new ones. */
generic_bignum[0] = number & 0xffffffff;
generic_bignum[1] = number >> 16;
}
/* Again, c is char after number, input_line_pointer->after c. */
if (num_little_digits > SIZE_OF_LARGE_NUMBER - 1)
num_little_digits = SIZE_OF_LARGE_NUMBER - 1;
gas_assert (num_little_digits >= 4);
if (num_little_digits != 8)
as_bad (_("a bignum with underscores must have exactly 4 words"));
/* We might have some leading zeros. These can be trimmed to give
us a change to fit this constant into a small number. */
while (generic_bignum[num_little_digits - 1] == 0
&& num_little_digits > 1)
num_little_digits--;
if (num_little_digits <= 2)
{
/* will fit into 32 bits. */
number = generic_bignum_to_int32 ();
small = 1;
}
#ifdef BFD64
else if (num_little_digits <= 4)
{
/* Will fit into 64 bits. */
number = generic_bignum_to_int64 ();
small = 1;
}
#endif
else
{
small = 0;
/* Number of littlenums in the bignum. */
number = num_little_digits;
}
}
else if (!small)
{
/* We saw a lot of digits. manufacture a bignum the hard way. */
LITTLENUM_TYPE *leader; /* -> high order littlenum of the bignum. */
LITTLENUM_TYPE *pointer; /* -> littlenum we are frobbing now. */
long carry;
leader = generic_bignum;
generic_bignum[0] = 0;
generic_bignum[1] = 0;
generic_bignum[2] = 0;
generic_bignum[3] = 0;
input_line_pointer = start; /* -> 1st digit. */
c = *input_line_pointer++;
for (; (carry = hex_value (c)) < maxdig; c = *input_line_pointer++)
{
for (pointer = generic_bignum; pointer <= leader; pointer++)
{
long work;
work = carry + radix * *pointer;
*pointer = work & LITTLENUM_MASK;
carry = work >> LITTLENUM_NUMBER_OF_BITS;
}
if (carry)
{
if (leader < generic_bignum + SIZE_OF_LARGE_NUMBER - 1)
{
/* Room to grow a longer bignum. */
*++leader = carry;
}
}
}
/* Again, c is char after number. */
/* input_line_pointer -> after c. */
know (LITTLENUM_NUMBER_OF_BITS == 16);
if (leader < generic_bignum + 2)
{
/* Will fit into 32 bits. */
number = generic_bignum_to_int32 ();
small = 1;
}
#ifdef BFD64
else if (leader < generic_bignum + 4)
{
/* Will fit into 64 bits. */
number = generic_bignum_to_int64 ();
small = 1;
}
#endif
else
{
/* Number of littlenums in the bignum. */
number = leader - generic_bignum + 1;
}
}
if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri)
&& suffix != NULL
&& input_line_pointer - 1 == suffix)
c = *input_line_pointer++;
if (small)
{
/* Here with number, in correct radix. c is the next char.
Note that unlike un*x, we allow "011f" "0x9f" to both mean
the same as the (conventional) "9f".
This is simply easier than checking for strict canonical
form. Syntax sux! */
if (LOCAL_LABELS_FB && c == 'b')
{
/* Backward ref to local label.
Because it is backward, expect it to be defined. */
/* Construct a local label. */
name = fb_label_name ((int) number, 0);
/* Seen before, or symbol is defined: OK. */
symbolP = symbol_find (name);
if ((symbolP != NULL) && (S_IS_DEFINED (symbolP)))
{
/* Local labels are never absolute. Don't waste time
checking absoluteness. */
know (SEG_NORMAL (S_GET_SEGMENT (symbolP)));
expressionP->X_op = O_symbol;
expressionP->X_add_symbol = symbolP;
}
else
{
/* Either not seen or not defined. */
/* @@ Should print out the original string instead of
the parsed number. */
as_bad (_("backward ref to unknown label \"%d:\""),
(int) number);
expressionP->X_op = O_constant;
}
expressionP->X_add_number = 0;
} /* case 'b' */
else if (LOCAL_LABELS_FB && c == 'f')
{
/* Forward reference. Expect symbol to be undefined or
unknown. undefined: seen it before. unknown: never seen
it before.
Construct a local label name, then an undefined symbol.
Don't create a xseg frag for it: caller may do that.
Just return it as never seen before. */
name = fb_label_name ((int) number, 1);
symbolP = symbol_find_or_make (name);
/* We have no need to check symbol properties. */
#ifndef many_segments
/* Since "know" puts its arg into a "string", we
can't have newlines in the argument. */
know (S_GET_SEGMENT (symbolP) == undefined_section || S_GET_SEGMENT (symbolP) == text_section || S_GET_SEGMENT (symbolP) == data_section);
#endif
expressionP->X_op = O_symbol;
expressionP->X_add_symbol = symbolP;
expressionP->X_add_number = 0;
} /* case 'f' */
else if (LOCAL_LABELS_DOLLAR && c == '$')
{
/* If the dollar label is *currently* defined, then this is just
another reference to it. If it is not *currently* defined,
then this is a fresh instantiation of that number, so create
it. */
if (dollar_label_defined ((long) number))
{
name = dollar_label_name ((long) number, 0);
symbolP = symbol_find (name);
know (symbolP != NULL);
}
else
{
name = dollar_label_name ((long) number, 1);
symbolP = symbol_find_or_make (name);
}
expressionP->X_op = O_symbol;
expressionP->X_add_symbol = symbolP;
expressionP->X_add_number = 0;
} /* case '$' */
else
{
expressionP->X_op = O_constant;
expressionP->X_add_number = number;
input_line_pointer--; /* Restore following character. */
} /* Really just a number. */
}
else
{
/* Not a small number. */
expressionP->X_op = O_big;
expressionP->X_add_number = number; /* Number of littlenums. */
input_line_pointer--; /* -> char following number. */
}
}
/* Parse an MRI multi character constant. */
static void
mri_char_constant (expressionS *expressionP)
{
int i;
if (*input_line_pointer == '\''
&& input_line_pointer[1] != '\'')
{
expressionP->X_op = O_constant;
expressionP->X_add_number = 0;
return;
}
/* In order to get the correct byte ordering, we must build the
number in reverse. */
for (i = SIZE_OF_LARGE_NUMBER - 1; i >= 0; i--)
{
int j;
generic_bignum[i] = 0;
for (j = 0; j < CHARS_PER_LITTLENUM; j++)
{
if (*input_line_pointer == '\'')
{
if (input_line_pointer[1] != '\'')
break;
++input_line_pointer;
}
generic_bignum[i] <<= 8;
generic_bignum[i] += *input_line_pointer;
++input_line_pointer;
}
if (i < SIZE_OF_LARGE_NUMBER - 1)
{
/* If there is more than one littlenum, left justify the
last one to make it match the earlier ones. If there is
only one, we can just use the value directly. */
for (; j < CHARS_PER_LITTLENUM; j++)
generic_bignum[i] <<= 8;
}
if (*input_line_pointer == '\''
&& input_line_pointer[1] != '\'')
break;
}
if (i < 0)
{
as_bad (_("character constant too large"));
i = 0;
}
if (i > 0)
{
int c;
int j;
c = SIZE_OF_LARGE_NUMBER - i;
for (j = 0; j < c; j++)
generic_bignum[j] = generic_bignum[i + j];
i = c;
}
know (LITTLENUM_NUMBER_OF_BITS == 16);
if (i > 2)
{
expressionP->X_op = O_big;
expressionP->X_add_number = i;
}
else
{
expressionP->X_op = O_constant;
if (i < 2)
expressionP->X_add_number = generic_bignum[0] & LITTLENUM_MASK;
else
expressionP->X_add_number =
(((generic_bignum[1] & LITTLENUM_MASK)
<< LITTLENUM_NUMBER_OF_BITS)
| (generic_bignum[0] & LITTLENUM_MASK));
}
/* Skip the final closing quote. */
++input_line_pointer;
}
/* Return an expression representing the current location. This
handles the magic symbol `.'. */
void
current_location (expressionS *expressionp)
{
if (now_seg == absolute_section)
{
expressionp->X_op = O_constant;
expressionp->X_add_number = abs_section_offset;
}
else
{
expressionp->X_op = O_symbol;
expressionp->X_add_symbol = &dot_symbol;
expressionp->X_add_number = 0;
}
}
/* In: Input_line_pointer points to 1st char of operand, which may
be a space.
Out: An expressionS.
The operand may have been empty: in this case X_op == O_absent.
Input_line_pointer->(next non-blank) char after operand. */
static segT
operand (expressionS *expressionP, enum expr_mode mode)
{
char c;
symbolS *symbolP; /* Points to symbol. */
char *name; /* Points to name of symbol. */
segT segment;
/* All integers are regarded as unsigned unless they are negated.
This is because the only thing which cares whether a number is
unsigned is the code in emit_expr which extends constants into
bignums. It should only sign extend negative numbers, so that
something like ``.quad 0x80000000'' is not sign extended even
though it appears negative if valueT is 32 bits. */
expressionP->X_unsigned = 1;
expressionP->X_extrabit = 0;
/* Digits, assume it is a bignum. */
SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */
c = *input_line_pointer++; /* input_line_pointer -> past char in c. */
if (is_end_of_line[(unsigned char) c])
goto eol;
switch (c)
{
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
input_line_pointer--;
integer_constant ((NUMBERS_WITH_SUFFIX || flag_m68k_mri)
? 0 : 10,
expressionP);
break;
#ifdef LITERAL_PREFIXDOLLAR_HEX
case '$':
/* $L is the start of a local label, not a hex constant. */
if (* input_line_pointer == 'L')
goto isname;
integer_constant (16, expressionP);
break;
#endif
#ifdef LITERAL_PREFIXPERCENT_BIN
case '%':
integer_constant (2, expressionP);
break;
#endif
case '0':
/* Non-decimal radix. */
if (NUMBERS_WITH_SUFFIX || flag_m68k_mri)
{
char *s;
/* Check for a hex or float constant. */
for (s = input_line_pointer; hex_p (*s); s++)
;
if (*s == 'h' || *s == 'H' || *input_line_pointer == '.')
{
--input_line_pointer;
integer_constant (0, expressionP);
break;
}
}
c = *input_line_pointer;
switch (c)
{
case 'o':
case 'O':
case 'q':
case 'Q':
case '8':
case '9':
if (NUMBERS_WITH_SUFFIX || flag_m68k_mri)
{
integer_constant (0, expressionP);
break;
}
/* Fall through. */
default:
default_case:
if (c && strchr (FLT_CHARS, c))
{
input_line_pointer++;
floating_constant (expressionP);
expressionP->X_add_number = - TOLOWER (c);
}
else
{
/* The string was only zero. */
expressionP->X_op = O_constant;
expressionP->X_add_number = 0;
}
break;
case 'x':
case 'X':
if (flag_m68k_mri)
goto default_case;
input_line_pointer++;
integer_constant (16, expressionP);
break;
case 'b':
if (LOCAL_LABELS_FB && ! (flag_m68k_mri || NUMBERS_WITH_SUFFIX))
{
/* This code used to check for '+' and '-' here, and, in
some conditions, fall through to call
integer_constant. However, that didn't make sense,
as integer_constant only accepts digits. */
/* Some of our code elsewhere does permit digits greater
than the expected base; for consistency, do the same
here. */
if (input_line_pointer[1] < '0'
|| input_line_pointer[1] > '9')
{
/* Parse this as a back reference to label 0. */
input_line_pointer--;
integer_constant (10, expressionP);
break;
}
/* Otherwise, parse this as a binary number. */
}
/* Fall through. */
case 'B':
input_line_pointer++;
if (flag_m68k_mri || NUMBERS_WITH_SUFFIX)
goto default_case;
integer_constant (2, expressionP);
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
integer_constant ((flag_m68k_mri || NUMBERS_WITH_SUFFIX)
? 0 : 8,
expressionP);
break;
case 'f':
if (LOCAL_LABELS_FB)
{
/* If it says "0f" and it could possibly be a floating point
number, make it one. Otherwise, make it a local label,
and try to deal with parsing the rest later. */
if (!input_line_pointer[1]
|| (is_end_of_line[0xff & input_line_pointer[1]])
|| strchr (FLT_CHARS, 'f') == NULL)
goto is_0f_label;
{
char *cp = input_line_pointer + 1;
int r = atof_generic (&cp, ".", EXP_CHARS,
&generic_floating_point_number);
switch (r)
{
case 0:
case ERROR_EXPONENT_OVERFLOW:
if (*cp == 'f' || *cp == 'b')
/* Looks like a difference expression. */
goto is_0f_label;
else if (cp == input_line_pointer + 1)
/* No characters has been accepted -- looks like
end of operand. */
goto is_0f_label;
else
goto is_0f_float;
default:
as_fatal (_("expr.c(operand): bad atof_generic return val %d"),
r);
}
}
/* Okay, now we've sorted it out. We resume at one of these
two labels, depending on what we've decided we're probably
looking at. */
is_0f_label:
input_line_pointer--;
integer_constant (10, expressionP);
break;
is_0f_float:
/* Fall through. */
;
}
case 'd':
case 'D':
if (flag_m68k_mri || NUMBERS_WITH_SUFFIX)
{
integer_constant (0, expressionP);
break;
}
/* Fall through. */
case 'F':
case 'r':
case 'e':
case 'E':
case 'g':
case 'G':
input_line_pointer++;
floating_constant (expressionP);
expressionP->X_add_number = - TOLOWER (c);
break;
case '$':
if (LOCAL_LABELS_DOLLAR)
{
integer_constant (10, expressionP);
break;
}
else
goto default_case;
}
break;
#ifndef NEED_INDEX_OPERATOR
case '[':
# ifdef md_need_index_operator
if (md_need_index_operator())
goto de_fault;
# endif
/* FALLTHROUGH */
#endif
case '(':
/* Didn't begin with digit & not a name. */
segment = expr (0, expressionP, mode);
/* expression () will pass trailing whitespace. */
if ((c == '(' && *input_line_pointer != ')')
|| (c == '[' && *input_line_pointer != ']'))
as_bad (_("missing '%c'"), c == '(' ? ')' : ']');
else
input_line_pointer++;
SKIP_WHITESPACE ();
/* Here with input_line_pointer -> char after "(...)". */
return segment;
#ifdef TC_M68K
case 'E':
if (! flag_m68k_mri || *input_line_pointer != '\'')
goto de_fault;
as_bad (_("EBCDIC constants are not supported"));
/* Fall through. */
case 'A':
if (! flag_m68k_mri || *input_line_pointer != '\'')
goto de_fault;
++input_line_pointer;
/* Fall through. */
#endif
case '\'':
if (! flag_m68k_mri)
{
/* Warning: to conform to other people's assemblers NO
ESCAPEMENT is permitted for a single quote. The next
character, parity errors and all, is taken as the value
of the operand. VERY KINKY. */
expressionP->X_op = O_constant;
expressionP->X_add_number = *input_line_pointer++;
break;
}
mri_char_constant (expressionP);
break;
#ifdef TC_M68K
case '"':
/* Double quote is the bitwise not operator in MRI mode. */
if (! flag_m68k_mri)
goto de_fault;
/* Fall through. */
#endif
case '~':
/* '~' is permitted to start a label on the Delta. */
if (is_name_beginner (c))
goto isname;
case '!':
case '-':
case '+':
{
#ifdef md_operator
unary:
#endif
operand (expressionP, mode);
if (expressionP->X_op == O_constant)
{
/* input_line_pointer -> char after operand. */
if (c == '-')
{
expressionP->X_add_number
= - (addressT) expressionP->X_add_number;
/* Notice: '-' may overflow: no warning is given.
This is compatible with other people's
assemblers. Sigh. */
expressionP->X_unsigned = 0;
if (expressionP->X_add_number)
expressionP->X_extrabit ^= 1;
}
else if (c == '~' || c == '"')
expressionP->X_add_number = ~ expressionP->X_add_number;
else if (c == '!')
expressionP->X_add_number = ! expressionP->X_add_number;
}
else if (expressionP->X_op == O_big
&& expressionP->X_add_number <= 0
&& c == '-'
&& (generic_floating_point_number.sign == '+'
|| generic_floating_point_number.sign == 'P'))
{
/* Negative flonum (eg, -1.000e0). */
if (generic_floating_point_number.sign == '+')
generic_floating_point_number.sign = '-';
else
generic_floating_point_number.sign = 'N';
}
else if (expressionP->X_op == O_big
&& expressionP->X_add_number > 0)
{
int i;
if (c == '~' || c == '-')
{
for (i = 0; i < expressionP->X_add_number; ++i)
generic_bignum[i] = ~generic_bignum[i];
/* Extend the bignum to at least the size of .octa. */
if (expressionP->X_add_number < SIZE_OF_LARGE_NUMBER)
{
expressionP->X_add_number = SIZE_OF_LARGE_NUMBER;
for (; i < expressionP->X_add_number; ++i)
generic_bignum[i] = ~(LITTLENUM_TYPE) 0;
}
if (c == '-')
for (i = 0; i < expressionP->X_add_number; ++i)
{
generic_bignum[i] += 1;
if (generic_bignum[i])
break;
}
}
else if (c == '!')
{
for (i = 0; i < expressionP->X_add_number; ++i)
if (generic_bignum[i] != 0)
break;
expressionP->X_add_number = i >= expressionP->X_add_number;
expressionP->X_op = O_constant;
expressionP->X_unsigned = 1;
expressionP->X_extrabit = 0;
}
}
else if (expressionP->X_op != O_illegal
&& expressionP->X_op != O_absent)
{
if (c != '+')
{
expressionP->X_add_symbol = make_expr_symbol (expressionP);
if (c == '-')
expressionP->X_op = O_uminus;
else if (c == '~' || c == '"')
expressionP->X_op = O_bit_not;
else
expressionP->X_op = O_logical_not;
expressionP->X_add_number = 0;
}
}
else
as_warn (_("Unary operator %c ignored because bad operand follows"),
c);
}
break;
#if defined (DOLLAR_DOT) || defined (TC_M68K)
case '$':
/* '$' is the program counter when in MRI mode, or when
DOLLAR_DOT is defined. */
#ifndef DOLLAR_DOT
if (! flag_m68k_mri)
goto de_fault;
#endif
if (DOLLAR_AMBIGU && hex_p (*input_line_pointer))
{
/* In MRI mode and on Z80, '$' is also used as the prefix
for a hexadecimal constant. */
integer_constant (16, expressionP);
break;
}
if (is_part_of_name (*input_line_pointer))
goto isname;
current_location (expressionP);
break;
#endif
case '.':
if (!is_part_of_name (*input_line_pointer))
{
current_location (expressionP);
break;
}
else if ((strncasecmp (input_line_pointer, "startof.", 8) == 0
&& ! is_part_of_name (input_line_pointer[8]))
|| (strncasecmp (input_line_pointer, "sizeof.", 7) == 0
&& ! is_part_of_name (input_line_pointer[7])))
{
int start;
start = (input_line_pointer[1] == 't'
|| input_line_pointer[1] == 'T');
input_line_pointer += start ? 8 : 7;
SKIP_WHITESPACE ();
if (*input_line_pointer != '(')
as_bad (_("syntax error in .startof. or .sizeof."));
else
{
char *buf;
++input_line_pointer;
SKIP_WHITESPACE ();
name = input_line_pointer;
c = get_symbol_end ();
buf = (char *) xmalloc (strlen (name) + 10);
if (start)
sprintf (buf, ".startof.%s", name);
else
sprintf (buf, ".sizeof.%s", name);
symbolP = symbol_make (buf);
free (buf);
expressionP->X_op = O_symbol;
expressionP->X_add_symbol = symbolP;
expressionP->X_add_number = 0;
*input_line_pointer = c;
SKIP_WHITESPACE ();
if (*input_line_pointer != ')')
as_bad (_("syntax error in .startof. or .sizeof."));
else
++input_line_pointer;
}
break;
}
else
{
goto isname;
}
case ',':
eol:
/* Can't imagine any other kind of operand. */
expressionP->X_op = O_absent;
input_line_pointer--;
break;
#ifdef TC_M68K
case '%':
if (! flag_m68k_mri)
goto de_fault;
integer_constant (2, expressionP);
break;
case '@':
if (! flag_m68k_mri)
goto de_fault;
integer_constant (8, expressionP);
break;
case ':':
if (! flag_m68k_mri)
goto de_fault;
/* In MRI mode, this is a floating point constant represented
using hexadecimal digits. */
++input_line_pointer;
integer_constant (16, expressionP);
break;
case '*':
if (! flag_m68k_mri || is_part_of_name (*input_line_pointer))
goto de_fault;
current_location (expressionP);
break;
#endif
default:
#if defined(md_need_index_operator) || defined(TC_M68K)
de_fault:
#endif
if (is_name_beginner (c)) /* Here if did not begin with a digit. */
{
/* Identifier begins here.
This is kludged for speed, so code is repeated. */
isname:
name = --input_line_pointer;
c = get_symbol_end ();
#ifdef md_operator
{
operatorT op = md_operator (name, 1, &c);
switch (op)
{
case O_uminus:
*input_line_pointer = c;
c = '-';
goto unary;
case O_bit_not:
*input_line_pointer = c;
c = '~';
goto unary;
case O_logical_not:
*input_line_pointer = c;
c = '!';
goto unary;
case O_illegal:
as_bad (_("invalid use of operator \"%s\""), name);
break;
default:
break;
}
if (op != O_absent && op != O_illegal)
{
*input_line_pointer = c;
expr (9, expressionP, mode);
expressionP->X_add_symbol = make_expr_symbol (expressionP);
expressionP->X_op_symbol = NULL;
expressionP->X_add_number = 0;
expressionP->X_op = op;
break;
}
}
#endif
#ifdef md_parse_name
/* This is a hook for the backend to parse certain names
specially in certain contexts. If a name always has a
specific value, it can often be handled by simply
entering it in the symbol table. */
if (md_parse_name (name, expressionP, mode, &c))
{
*input_line_pointer = c;
break;
}
#endif
#ifdef TC_I960
/* The MRI i960 assembler permits
lda sizeof code,g13
FIXME: This should use md_parse_name. */
if (flag_mri
&& (strcasecmp (name, "sizeof") == 0
|| strcasecmp (name, "startof") == 0))
{
int start;
char *buf;
start = (name[1] == 't'
|| name[1] == 'T');
*input_line_pointer = c;
SKIP_WHITESPACE ();
name = input_line_pointer;
c = get_symbol_end ();
buf = (char *) xmalloc (strlen (name) + 10);
if (start)
sprintf (buf, ".startof.%s", name);
else
sprintf (buf, ".sizeof.%s", name);
symbolP = symbol_make (buf);
free (buf);
expressionP->X_op = O_symbol;
expressionP->X_add_symbol = symbolP;
expressionP->X_add_number = 0;
*input_line_pointer = c;
SKIP_WHITESPACE ();
break;
}
#endif
symbolP = symbol_find_or_make (name);
/* If we have an absolute symbol or a reg, then we know its
value now. */
segment = S_GET_SEGMENT (symbolP);
if (mode != expr_defer
&& segment == absolute_section
&& !S_FORCE_RELOC (symbolP, 0))
{
expressionP->X_op = O_constant;
expressionP->X_add_number = S_GET_VALUE (symbolP);
}
else if (mode != expr_defer && segment == reg_section)
{
expressionP->X_op = O_register;
expressionP->X_add_number = S_GET_VALUE (symbolP);
}
else
{
expressionP->X_op = O_symbol;
expressionP->X_add_symbol = symbolP;
expressionP->X_add_number = 0;
}
*input_line_pointer = c;
}
else
{
/* Let the target try to parse it. Success is indicated by changing
the X_op field to something other than O_absent and pointing
input_line_pointer past the expression. If it can't parse the
expression, X_op and input_line_pointer should be unchanged. */
expressionP->X_op = O_absent;
--input_line_pointer;
md_operand (expressionP);
if (expressionP->X_op == O_absent)
{
++input_line_pointer;
as_bad (_("bad expression"));
expressionP->X_op = O_constant;
expressionP->X_add_number = 0;
}
}
break;
}
/* It is more 'efficient' to clean up the expressionS when they are
created. Doing it here saves lines of code. */
clean_up_expression (expressionP);
SKIP_WHITESPACE (); /* -> 1st char after operand. */
know (*input_line_pointer != ' ');
/* The PA port needs this information. */
if (expressionP->X_add_symbol)
symbol_mark_used (expressionP->X_add_symbol);
if (mode != expr_defer)
{
expressionP->X_add_symbol
= symbol_clone_if_forward_ref (expressionP->X_add_symbol);
expressionP->X_op_symbol
= symbol_clone_if_forward_ref (expressionP->X_op_symbol);
}
switch (expressionP->X_op)
{
default:
return absolute_section;
case O_symbol:
return S_GET_SEGMENT (expressionP->X_add_symbol);
case O_register:
return reg_section;
}
}
/* Internal. Simplify a struct expression for use by expr (). */
/* In: address of an expressionS.
The X_op field of the expressionS may only take certain values.
Elsewise we waste time special-case testing. Sigh. Ditto SEG_ABSENT.
Out: expressionS may have been modified:
Unused fields zeroed to help expr (). */
static void
clean_up_expression (expressionS *expressionP)
{
switch (expressionP->X_op)
{
case O_illegal:
case O_absent:
expressionP->X_add_number = 0;
/* Fall through. */
case O_big:
case O_constant:
case O_register:
expressionP->X_add_symbol = NULL;
/* Fall through. */
case O_symbol:
case O_uminus:
case O_bit_not:
expressionP->X_op_symbol = NULL;
break;
default:
break;
}
}
/* Expression parser. */
/* We allow an empty expression, and just assume (absolute,0) silently.
Unary operators and parenthetical expressions are treated as operands.
As usual, Q==quantity==operand, O==operator, X==expression mnemonics.
We used to do an aho/ullman shift-reduce parser, but the logic got so
warped that I flushed it and wrote a recursive-descent parser instead.
Now things are stable, would anybody like to write a fast parser?
Most expressions are either register (which does not even reach here)
or 1 symbol. Then "symbol+constant" and "symbol-symbol" are common.
So I guess it doesn't really matter how inefficient more complex expressions
are parsed.
After expr(RANK,resultP) input_line_pointer->operator of rank <= RANK.
Also, we have consumed any leading or trailing spaces (operand does that)
and done all intervening operators.
This returns the segment of the result, which will be
absolute_section or the segment of a symbol. */
#undef __
#define __ O_illegal
#ifndef O_SINGLE_EQ
#define O_SINGLE_EQ O_illegal
#endif
/* Maps ASCII -> operators. */
static const operatorT op_encoding[256] = {
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, O_bit_or_not, __, __, __, O_modulus, O_bit_and, __,
__, __, O_multiply, O_add, __, O_subtract, __, O_divide,
__, __, __, __, __, __, __, __,
__, __, __, __, O_lt, O_SINGLE_EQ, O_gt, __,
__, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __,
__, __, __,
#ifdef NEED_INDEX_OPERATOR
O_index,
#else
__,
#endif
__, __, O_bit_exclusive_or, __,
__, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __,
__, __, __, __, O_bit_inclusive_or, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __
};
/* Rank Examples
0 operand, (expression)
1 ||
2 &&
3 == <> < <= >= >
4 + -
5 used for * / % in MRI mode
6 & ^ ! |
7 * / % << >>
8 unary - unary ~
*/
static operator_rankT op_rank[O_max] = {
0, /* O_illegal */
0, /* O_absent */
0, /* O_constant */
0, /* O_symbol */
0, /* O_symbol_rva */
0, /* O_register */
0, /* O_big */
9, /* O_uminus */
9, /* O_bit_not */
9, /* O_logical_not */
8, /* O_multiply */
8, /* O_divide */
8, /* O_modulus */
8, /* O_left_shift */
8, /* O_right_shift */
7, /* O_bit_inclusive_or */
7, /* O_bit_or_not */
7, /* O_bit_exclusive_or */
7, /* O_bit_and */
5, /* O_add */
5, /* O_subtract */
4, /* O_eq */
4, /* O_ne */
4, /* O_lt */
4, /* O_le */
4, /* O_ge */
4, /* O_gt */
3, /* O_logical_and */
2, /* O_logical_or */
1, /* O_index */
};
/* Unfortunately, in MRI mode for the m68k, multiplication and
division have lower precedence than the bit wise operators. This
function sets the operator precedences correctly for the current
mode. Also, MRI uses a different bit_not operator, and this fixes
that as well. */
#define STANDARD_MUL_PRECEDENCE 8
#define MRI_MUL_PRECEDENCE 6
void
expr_set_precedence (void)
{
if (flag_m68k_mri)
{
op_rank[O_multiply] = MRI_MUL_PRECEDENCE;
op_rank[O_divide] = MRI_MUL_PRECEDENCE;
op_rank[O_modulus] = MRI_MUL_PRECEDENCE;
}
else
{
op_rank[O_multiply] = STANDARD_MUL_PRECEDENCE;
op_rank[O_divide] = STANDARD_MUL_PRECEDENCE;
op_rank[O_modulus] = STANDARD_MUL_PRECEDENCE;
}
}
void
expr_set_rank (operatorT op, operator_rankT rank)
{
gas_assert (op >= O_md1 && op < ARRAY_SIZE (op_rank));
op_rank[op] = rank;
}
/* Initialize the expression parser. */
void
expr_begin (void)
{
expr_set_precedence ();
/* Verify that X_op field is wide enough. */
{
expressionS e;
e.X_op = O_max;
gas_assert (e.X_op == O_max);
}
}
/* Return the encoding for the operator at INPUT_LINE_POINTER, and
sets NUM_CHARS to the number of characters in the operator.
Does not advance INPUT_LINE_POINTER. */
static inline operatorT
operatorf (int *num_chars)
{
int c;
operatorT ret;
c = *input_line_pointer & 0xff;
*num_chars = 1;
if (is_end_of_line[c])
return O_illegal;
#ifdef md_operator
if (is_name_beginner (c))
{
char *name = input_line_pointer;
char ec = get_symbol_end ();
ret = md_operator (name, 2, &ec);
switch (ret)
{
case O_absent:
*input_line_pointer = ec;
input_line_pointer = name;
break;
case O_uminus:
case O_bit_not:
case O_logical_not:
as_bad (_("invalid use of operator \"%s\""), name);
ret = O_illegal;
/* FALLTHROUGH */
default:
*input_line_pointer = ec;
*num_chars = input_line_pointer - name;
input_line_pointer = name;
return ret;
}
}
#endif
switch (c)
{
default:
ret = op_encoding[c];
#ifdef md_operator
if (ret == O_illegal)
{
char *start = input_line_pointer;
ret = md_operator (NULL, 2, NULL);
if (ret != O_illegal)
*num_chars = input_line_pointer - start;
input_line_pointer = start;
}
#endif
return ret;
case '+':
case '-':
return op_encoding[c];
case '<':
switch (input_line_pointer[1])
{
default:
return op_encoding[c];
case '<':
ret = O_left_shift;
break;
case '>':
ret = O_ne;
break;
case '=':
ret = O_le;
break;
}
*num_chars = 2;
return ret;
case '=':
if (input_line_pointer[1] != '=')
return op_encoding[c];
*num_chars = 2;
return O_eq;
case '>':
switch (input_line_pointer[1])
{
default:
return op_encoding[c];
case '>':
ret = O_right_shift;
break;
case '=':
ret = O_ge;
break;
}
*num_chars = 2;
return ret;
case '!':
switch (input_line_pointer[1])
{
case '!':
/* We accept !! as equivalent to ^ for MRI compatibility. */
*num_chars = 2;
return O_bit_exclusive_or;
case '=':
/* We accept != as equivalent to <>. */
*num_chars = 2;
return O_ne;
default:
if (flag_m68k_mri)
return O_bit_inclusive_or;
return op_encoding[c];
}
case '|':
if (input_line_pointer[1] != '|')
return op_encoding[c];
*num_chars = 2;
return O_logical_or;
case '&':
if (input_line_pointer[1] != '&')
return op_encoding[c];
*num_chars = 2;
return O_logical_and;
}
/* NOTREACHED */
}
/* Implement "word-size + 1 bit" addition for
{resultP->X_extrabit:resultP->X_add_number} + {rhs_highbit:amount}. This
is used so that the full range of unsigned word values and the full range of
signed word values can be represented in an O_constant expression, which is
useful e.g. for .sleb128 directives. */
void
add_to_result (expressionS *resultP, offsetT amount, int rhs_highbit)
{
valueT ures = resultP->X_add_number;
valueT uamount = amount;
resultP->X_add_number += amount;
resultP->X_extrabit ^= rhs_highbit;
if (ures + uamount < ures)
resultP->X_extrabit ^= 1;
}
/* Similarly, for subtraction. */
void
subtract_from_result (expressionS *resultP, offsetT amount, int rhs_highbit)
{
valueT ures = resultP->X_add_number;
valueT uamount = amount;
resultP->X_add_number -= amount;
resultP->X_extrabit ^= rhs_highbit;
if (ures < uamount)
resultP->X_extrabit ^= 1;
}
/* Parse an expression. */
segT
expr (int rankarg, /* Larger # is higher rank. */
expressionS *resultP, /* Deliver result here. */
enum expr_mode mode /* Controls behavior. */)
{
operator_rankT rank = (operator_rankT) rankarg;
segT retval;
expressionS right;
operatorT op_left;
operatorT op_right;
int op_chars;
know (rankarg >= 0);
/* Save the value of dot for the fixup code. */
if (rank == 0)
{
dot_value = frag_now_fix ();
dot_frag = frag_now;
}
retval = operand (resultP, mode);
/* operand () gobbles spaces. */
know (*input_line_pointer != ' ');
op_left = operatorf (&op_chars);
while (op_left != O_illegal && op_rank[(int) op_left] > rank)
{
segT rightseg;
offsetT frag_off;
input_line_pointer += op_chars; /* -> after operator. */
right.X_md = 0;
rightseg = expr (op_rank[(int) op_left], &right, mode);
if (right.X_op == O_absent)
{
as_warn (_("missing operand; zero assumed"));
right.X_op = O_constant;
right.X_add_number = 0;
right.X_add_symbol = NULL;
right.X_op_symbol = NULL;
}
know (*input_line_pointer != ' ');
if (op_left == O_index)
{
if (*input_line_pointer != ']')
as_bad ("missing right bracket");
else
{
++input_line_pointer;
SKIP_WHITESPACE ();
}
}
op_right = operatorf (&op_chars);
know (op_right == O_illegal || op_left == O_index
|| op_rank[(int) op_right] <= op_rank[(int) op_left]);
know ((int) op_left >= (int) O_multiply);
#ifndef md_operator
know ((int) op_left <= (int) O_index);
#else
know ((int) op_left < (int) O_max);
#endif
/* input_line_pointer->after right-hand quantity. */
/* left-hand quantity in resultP. */
/* right-hand quantity in right. */
/* operator in op_left. */
if (resultP->X_op == O_big)
{
if (resultP->X_add_number > 0)
as_warn (_("left operand is a bignum; integer 0 assumed"));
else
as_warn (_("left operand is a float; integer 0 assumed"));
resultP->X_op = O_constant;
resultP->X_add_number = 0;
resultP->X_add_symbol = NULL;
resultP->X_op_symbol = NULL;
}
if (right.X_op == O_big)
{
if (right.X_add_number > 0)
as_warn (_("right operand is a bignum; integer 0 assumed"));
else
as_warn (_("right operand is a float; integer 0 assumed"));
right.X_op = O_constant;
right.X_add_number = 0;
right.X_add_symbol = NULL;
right.X_op_symbol = NULL;
}
/* Optimize common cases. */
#ifdef md_optimize_expr
if (md_optimize_expr (resultP, op_left, &right))
{
/* Skip. */
;
}
else
#endif
#ifndef md_register_arithmetic
# define md_register_arithmetic 1
#endif
if (op_left == O_add && right.X_op == O_constant
&& (md_register_arithmetic || resultP->X_op != O_register))
{
/* X + constant. */
add_to_result (resultP, right.X_add_number, right.X_extrabit);
}
/* This case comes up in PIC code. */
else if (op_left == O_subtract
&& right.X_op == O_symbol
&& resultP->X_op == O_symbol
&& retval == rightseg
#ifdef md_allow_local_subtract
&& md_allow_local_subtract (resultP, & right, rightseg)
#endif
&& ((SEG_NORMAL (rightseg)
&& !S_FORCE_RELOC (resultP->X_add_symbol, 0)
&& !S_FORCE_RELOC (right.X_add_symbol, 0))
|| right.X_add_symbol == resultP->X_add_symbol)
&& frag_offset_fixed_p (symbol_get_frag (resultP->X_add_symbol),
symbol_get_frag (right.X_add_symbol),
&frag_off))
{
offsetT symval_diff = S_GET_VALUE (resultP->X_add_symbol)
- S_GET_VALUE (right.X_add_symbol);
subtract_from_result (resultP, right.X_add_number, right.X_extrabit);
subtract_from_result (resultP, frag_off / OCTETS_PER_BYTE, 0);
add_to_result (resultP, symval_diff, symval_diff < 0);
resultP->X_op = O_constant;
resultP->X_add_symbol = 0;
}
else if (op_left == O_subtract && right.X_op == O_constant
&& (md_register_arithmetic || resultP->X_op != O_register))
{
/* X - constant. */
subtract_from_result (resultP, right.X_add_number, right.X_extrabit);
}
else if (op_left == O_add && resultP->X_op == O_constant
&& (md_register_arithmetic || right.X_op != O_register))
{
/* Constant + X. */
resultP->X_op = right.X_op;
resultP->X_add_symbol = right.X_add_symbol;
resultP->X_op_symbol = right.X_op_symbol;
add_to_result (resultP, right.X_add_number, right.X_extrabit);
retval = rightseg;
}
else if (resultP->X_op == O_constant && right.X_op == O_constant)
{
/* Constant OP constant. */
offsetT v = right.X_add_number;
if (v == 0 && (op_left == O_divide || op_left == O_modulus))
{
as_warn (_("division by zero"));
v = 1;
}
if ((valueT) v >= sizeof(valueT) * CHAR_BIT
&& (op_left == O_left_shift || op_left == O_right_shift))
{
as_warn_value_out_of_range (_("shift count"), v, 0,
sizeof(valueT) * CHAR_BIT - 1,
NULL, 0);
resultP->X_add_number = v = 0;
}
switch (op_left)
{
default: goto general;
case O_multiply: resultP->X_add_number *= v; break;
case O_divide: resultP->X_add_number /= v; break;
case O_modulus: resultP->X_add_number %= v; break;
case O_left_shift: resultP->X_add_number <<= v; break;
case O_right_shift:
/* We always use unsigned shifts, to avoid relying on
characteristics of the compiler used to compile gas. */
resultP->X_add_number =
(offsetT) ((valueT) resultP->X_add_number >> (valueT) v);
break;
case O_bit_inclusive_or: resultP->X_add_number |= v; break;
case O_bit_or_not: resultP->X_add_number |= ~v; break;
case O_bit_exclusive_or: resultP->X_add_number ^= v; break;
case O_bit_and: resultP->X_add_number &= v; break;
/* Constant + constant (O_add) is handled by the
previous if statement for constant + X, so is omitted
here. */
case O_subtract:
subtract_from_result (resultP, v, 0);
break;
case O_eq:
resultP->X_add_number =
resultP->X_add_number == v ? ~ (offsetT) 0 : 0;
break;
case O_ne:
resultP->X_add_number =
resultP->X_add_number != v ? ~ (offsetT) 0 : 0;
break;
case O_lt:
resultP->X_add_number =
resultP->X_add_number < v ? ~ (offsetT) 0 : 0;
break;
case O_le:
resultP->X_add_number =
resultP->X_add_number <= v ? ~ (offsetT) 0 : 0;
break;
case O_ge:
resultP->X_add_number =
resultP->X_add_number >= v ? ~ (offsetT) 0 : 0;
break;
case O_gt:
resultP->X_add_number =
resultP->X_add_number > v ? ~ (offsetT) 0 : 0;
break;
case O_logical_and:
resultP->X_add_number = resultP->X_add_number && v;
break;
case O_logical_or:
resultP->X_add_number = resultP->X_add_number || v;
break;
}
}
else if (resultP->X_op == O_symbol
&& right.X_op == O_symbol
&& (op_left == O_add
|| op_left == O_subtract
|| (resultP->X_add_number == 0
&& right.X_add_number == 0)))
{
/* Symbol OP symbol. */
resultP->X_op = op_left;
resultP->X_op_symbol = right.X_add_symbol;
if (op_left == O_add)
add_to_result (resultP, right.X_add_number, right.X_extrabit);
else if (op_left == O_subtract)
{
subtract_from_result (resultP, right.X_add_number,
right.X_extrabit);
if (retval == rightseg
&& SEG_NORMAL (retval)
&& !S_FORCE_RELOC (resultP->X_add_symbol, 0)
&& !S_FORCE_RELOC (right.X_add_symbol, 0))
{
retval = absolute_section;
rightseg = absolute_section;
}
}
}
else
{
general:
/* The general case. */
resultP->X_add_symbol = make_expr_symbol (resultP);
resultP->X_op_symbol = make_expr_symbol (&right);
resultP->X_op = op_left;
resultP->X_add_number = 0;
resultP->X_unsigned = 1;
resultP->X_extrabit = 0;
}
if (retval != rightseg)
{
if (retval == undefined_section)
;
else if (rightseg == undefined_section)
retval = rightseg;
else if (retval == expr_section)
;
else if (rightseg == expr_section)
retval = rightseg;
else if (retval == reg_section)
;
else if (rightseg == reg_section)
retval = rightseg;
else if (rightseg == absolute_section)
;
else if (retval == absolute_section)
retval = rightseg;
#ifdef DIFF_EXPR_OK
else if (op_left == O_subtract)
;
#endif
else
as_bad (_("operation combines symbols in different segments"));
}
op_left = op_right;
} /* While next operator is >= this rank. */
/* The PA port needs this information. */
if (resultP->X_add_symbol)
symbol_mark_used (resultP->X_add_symbol);
if (rank == 0 && mode == expr_evaluate)
resolve_expression (resultP);
return resultP->X_op == O_constant ? absolute_section : retval;
}
/* Resolve an expression without changing any symbols/sub-expressions
used. */
int
resolve_expression (expressionS *expressionP)
{
/* Help out with CSE. */
valueT final_val = expressionP->X_add_number;
symbolS *add_symbol = expressionP->X_add_symbol;
symbolS *orig_add_symbol = add_symbol;
symbolS *op_symbol = expressionP->X_op_symbol;
operatorT op = expressionP->X_op;
valueT left, right;
segT seg_left, seg_right;
fragS *frag_left, *frag_right;
offsetT frag_off;
switch (op)
{
default:
return 0;
case O_constant:
case O_register:
left = 0;
break;
case O_symbol:
case O_symbol_rva:
if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left))
return 0;
break;
case O_uminus:
case O_bit_not:
case O_logical_not:
if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left))
return 0;
if (seg_left != absolute_section)
return 0;
if (op == O_logical_not)
left = !left;
else if (op == O_uminus)
left = -left;
else
left = ~left;
op = O_constant;
break;
case O_multiply:
case O_divide:
case O_modulus:
case O_left_shift:
case O_right_shift:
case O_bit_inclusive_or:
case O_bit_or_not:
case O_bit_exclusive_or:
case O_bit_and:
case O_add:
case O_subtract:
case O_eq:
case O_ne:
case O_lt:
case O_le:
case O_ge:
case O_gt:
case O_logical_and:
case O_logical_or:
if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left)
|| !snapshot_symbol (&op_symbol, &right, &seg_right, &frag_right))
return 0;
/* Simplify addition or subtraction of a constant by folding the
constant into X_add_number. */
if (op == O_add)
{
if (seg_right == absolute_section)
{
final_val += right;
op = O_symbol;
break;
}
else if (seg_left == absolute_section)
{
final_val += left;
left = right;
seg_left = seg_right;
add_symbol = op_symbol;
orig_add_symbol = expressionP->X_op_symbol;
op = O_symbol;
break;
}
}
else if (op == O_subtract)
{
if (seg_right == absolute_section)
{
final_val -= right;
op = O_symbol;
break;
}
}
/* Equality and non-equality tests are permitted on anything.
Subtraction, and other comparison operators are permitted if
both operands are in the same section.
Shifts by constant zero are permitted on anything.
Multiplies, bit-ors, and bit-ands with constant zero are
permitted on anything.
Multiplies and divides by constant one are permitted on
anything.
Binary operations with both operands being the same register
or undefined symbol are permitted if the result doesn't depend
on the input value.
Otherwise, both operands must be absolute. We already handled
the case of addition or subtraction of a constant above. */
frag_off = 0;
if (!(seg_left == absolute_section
&& seg_right == absolute_section)
&& !(op == O_eq || op == O_ne)
&& !((op == O_subtract
|| op == O_lt || op == O_le || op == O_ge || op == O_gt)
&& seg_left == seg_right
&& (finalize_syms
|| frag_offset_fixed_p (frag_left, frag_right, &frag_off))
&& (seg_left != reg_section || left == right)
&& (seg_left != undefined_section || add_symbol == op_symbol)))
{
if ((seg_left == absolute_section && left == 0)
|| (seg_right == absolute_section && right == 0))
{
if (op == O_bit_exclusive_or || op == O_bit_inclusive_or)
{
if (!(seg_right == absolute_section && right == 0))
{
seg_left = seg_right;
left = right;
add_symbol = op_symbol;
orig_add_symbol = expressionP->X_op_symbol;
}
op = O_symbol;
break;
}
else if (op == O_left_shift || op == O_right_shift)
{
if (!(seg_left == absolute_section && left == 0))
{
op = O_symbol;
break;
}
}
else if (op != O_multiply
&& op != O_bit_or_not && op != O_bit_and)
return 0;
}
else if (op == O_multiply
&& seg_left == absolute_section && left == 1)
{
seg_left = seg_right;
left = right;
add_symbol = op_symbol;
orig_add_symbol = expressionP->X_op_symbol;
op = O_symbol;
break;
}
else if ((op == O_multiply || op == O_divide)
&& seg_right == absolute_section && right == 1)
{
op = O_symbol;
break;
}
else if (!(left == right
&& ((seg_left == reg_section && seg_right == reg_section)
|| (seg_left == undefined_section
&& seg_right == undefined_section
&& add_symbol == op_symbol))))
return 0;
else if (op == O_bit_and || op == O_bit_inclusive_or)
{
op = O_symbol;
break;
}
else if (op != O_bit_exclusive_or && op != O_bit_or_not)
return 0;
}
right += frag_off / OCTETS_PER_BYTE;
switch (op)
{
case O_add: left += right; break;
case O_subtract: left -= right; break;
case O_multiply: left *= right; break;
case O_divide:
if (right == 0)
return 0;
left = (offsetT) left / (offsetT) right;
break;
case O_modulus:
if (right == 0)
return 0;
left = (offsetT) left % (offsetT) right;
break;
case O_left_shift: left <<= right; break;
case O_right_shift: left >>= right; break;
case O_bit_inclusive_or: left |= right; break;
case O_bit_or_not: left |= ~right; break;
case O_bit_exclusive_or: left ^= right; break;
case O_bit_and: left &= right; break;
case O_eq:
case O_ne:
left = (left == right
&& seg_left == seg_right
&& (finalize_syms || frag_left == frag_right)
&& (seg_left != undefined_section
|| add_symbol == op_symbol)
? ~ (valueT) 0 : 0);
if (op == O_ne)
left = ~left;
break;
case O_lt:
left = (offsetT) left < (offsetT) right ? ~ (valueT) 0 : 0;
break;
case O_le:
left = (offsetT) left <= (offsetT) right ? ~ (valueT) 0 : 0;
break;
case O_ge:
left = (offsetT) left >= (offsetT) right ? ~ (valueT) 0 : 0;
break;
case O_gt:
left = (offsetT) left > (offsetT) right ? ~ (valueT) 0 : 0;
break;
case O_logical_and: left = left && right; break;
case O_logical_or: left = left || right; break;
default: abort ();
}
op = O_constant;
break;
}
if (op == O_symbol)
{
if (seg_left == absolute_section)
op = O_constant;
else if (seg_left == reg_section && final_val == 0)
op = O_register;
else if (!symbol_same_p (add_symbol, orig_add_symbol))
final_val += left;
expressionP->X_add_symbol = add_symbol;
}
expressionP->X_op = op;
if (op == O_constant || op == O_register)
final_val += left;
expressionP->X_add_number = final_val;
return 1;
}
/* This lives here because it belongs equally in expr.c & read.c.
expr.c is just a branch office read.c anyway, and putting it
here lessens the crowd at read.c.
Assume input_line_pointer is at start of symbol name.
Advance input_line_pointer past symbol name.
Turn that character into a '\0', returning its former value.
This allows a string compare (RMS wants symbol names to be strings)
of the symbol name.
There will always be a char following symbol name, because all good
lines end in end-of-line. */
char
get_symbol_end (void)
{
char c;
/* We accept \001 in a name in case this is being called with a
constructed string. */
if (is_name_beginner (c = *input_line_pointer++) || c == '\001')
{
while (is_part_of_name (c = *input_line_pointer++)
|| c == '\001')
;
if (is_name_ender (c))
c = *input_line_pointer++;
}
*--input_line_pointer = 0;
return (c);
}
unsigned int
get_single_number (void)
{
expressionS exp;
operand (&exp, expr_normal);
return exp.X_add_number;
}
|